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Gewählte Master / Diploma Thesis:

Naomi Kreinz (2009): Quantification of Morphological Characteristics caused by Floods.
Master / Diploma Thesis, BOKU-Universität für Bodenkultur, pp 124. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
ABSTRACT The aim of this thesis is to examine the morphological changes that occurred at the Kamp River in Lower Austria in August 2002. It also looks at the morphologic processes of change along river reaches during flood events. The August 2002 floods that hit Austria caused substantial geomorphologic changes along the Kamp. The 1000-year flood with discharges at recurrence intervals ranging from 500 years and 2000 years, approximated at 700 to 800 m3/s caused the formation of secondary channels along some sections of the channel, while other sections showed no visible morphological changes. The flooding process and the geomorphic changes as a result of the flood were analysed using a hydrodynamic numerical model and empirical equations identified in literature. Detailed channel cross section surveys and post-flood aerial photographs facilitated the examination of downstream hydraulic geometry and channel adjustment after the flood. The formation of secondary channels seemed to be governed by the relationship between constricted/narrow channels and expanded/wider channels. The narrowing of channels could have increased energy at thresholds higher than the erosive threshold which led to overland scouring on the floodplain. This thesis also found that thresholds like stream power and shear stress that initiate channel change varies from one river to another river. Therefore this fact should be taken into account when using thresholds from one region to explain catastrophic change in another.

Beurteilende(r): Habersack Helmut

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